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fuse: add simple background helper 

Create a helper named fuse_simple_background() that is similar to
fuse_simple_request().  Unlike the latter, it returns immediately and calls
the supplied 'end' callback when the reply is received.

The supplied 'args' pointer is stored in 'fuse_req' which allows the
callback to interpret the output arguments decoded from the reply.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2019-09-10 15:04:10 +02:00
parent 338f2e3f33
commit 1259728731
2 changed files with 51 additions and 0 deletions
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45
fs/fuse/dev.c
View File

@ -626,6 +626,51 @@ bool fuse_request_queue_background(struct fuse_conn *fc, struct fuse_req *req)
return queued;
}
static void fuse_simple_end(struct fuse_conn *fc, struct fuse_req *req)
{
struct fuse_args *args = req->args;
int err = req->out.h.error;
if (!err && args->out_argvar) {
BUG_ON(args->out_numargs == 0);
args->out_args[args->out_numargs - 1].size =
req->out.args[args->out_numargs - 1].size;
}
req->args->end(fc, req->args, req->out.h.error);
}
int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
gfp_t gfp_flags)
{
struct fuse_req *req;
if (args->force) {
WARN_ON(!args->nocreds);
req = __fuse_request_alloc(0, gfp_flags);
if (!req)
return -ENOMEM;
__set_bit(FR_BACKGROUND, &req->flags);
} else {
WARN_ON(args->nocreds);
req = __fuse_get_req(fc, 0, true);
if (IS_ERR(req))
return PTR_ERR(req);
}
fuse_args_to_req(req, args);
req->args = args;
req->end = fuse_simple_end;
if (!fuse_request_queue_background(fc, req)) {
fuse_put_request(fc, req);
return -ENOTCONN;
}
return 0;
}
EXPORT_SYMBOL_GPL(fuse_simple_background);
void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req)
{
WARN_ON(!req->end);

6
fs/fuse/fuse_i.h
View File

@ -301,6 +301,7 @@ struct fuse_args {
bool page_replace:1;
struct fuse_in_arg in_args[3];
struct fuse_arg out_args[2];
void (*end)(struct fuse_conn *fc, struct fuse_args *args, int error);
};
struct fuse_args_pages {
@ -381,6 +382,9 @@ struct fuse_req {
/** Entry on the interrupts list */
struct list_head intr_entry;
/* Input/output arguments */
struct fuse_args *args;
/** refcount */
refcount_t count;
@ -948,6 +952,8 @@ void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
* Simple request sending that does request allocation and freeing
*/
ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
gfp_t gfp_flags);
/**
* Send a request in the background